A couple of severe thunderstorms produced some large hail over parts of southeast Wyoming.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
A couple of severe thunderstorms produced some large hail over parts of southeast Wyoming.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before the first event at May 7, 12:37 PM MST, 2 hours 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 137 PM MDT WED MAY 7 2008 .SHORT TERM...TONIGHT THROUGH FRIDAY AFTERNOON. TONIGHT...SCATTERED THUNDERSTORMS CONTINUE TO DEVELOP ALONG LOW LEVEL CONVERGENCE AXIS FROM SOUTHWEST CONVERSE COUNTY THROUGH ALBANY COUNTY. EXPECT THUNDERSTORM COVERAGE TO CONTINUE TO INCREASE IN AREAL COVERAGE AND INTENSITY AS THE AFTERNOON PROGRESSES WITH DIFFERENTIAL HEATING AND APPROACH OF SYNOPTIC LIFT WITH APPROACHING SHORTWAVE TROUGH. WITH SURFACE LOW DEVELOPING ACROSS EAST CENTRAL WYOMING THIS EVENING AND LIFT FROM SHORTWAVE TROUGH PASSING ACROSS NORTHERN WYOMING...WILL SEE MOST NUMEROUS THUNDERSTORMS THIS EVENING ACROSS CONVERSE AND NIOBRARA COUNTIES ALONG LOW LEVEL CONVERGENCE AXIS. ALTHOUGH WIND SHEAR FAVORABLE...LIMITED CAPE SUGGESTS THUNDERSTORMS REMAINING BELOW SEVERE LEVELS. PRECIPITABLE WATER VALUES AND MEAN STORM MOTION INDICATES AVERAGE RAINFALL AMOUNTS FROM 0.25 TO 0.50 INCH WITH LOCAL AMOUNTS UP TO ONE INCH FROM STRONGER STORMS. ALTHOUGH WILL SEE A MESOSCALE CONVECTIVE COMPLEX FORM LATE THIS EVENING ACROSS SOUTHEAST MONTANA AND NORTHWEST SOUTH DAKOTA... WILL SEE SCATTERED THUNDERSTORMS AFTER MIDNIGHT ACROSS OUR WESTERN NEBRASKA COUNTIES ALONG PASSING SURFACE TROUGH AXIS. THURSDAY...DRIER AND MORE STABLE ATMOSPHERE WILL BE ADVECTED ACROSS SOUTHEAST WYOMING IN THE WAKE OF THE SHORTWAVE TROUGH AND WITH NEGATIVE THETA-E ADVECTION. STILL THOUGH...WITH TIME OF YEAR CONSIDERATIONS AND ENOUGH LOW LEVEL MOISTURE...CANNOT RULE OUT ISOLATED AFTERNOON AND EVENING THUNDERSTORMS...ALTHOUGH LESS COVERAGE THAN TODAY. THURSDAY NIGHT...MOSTLY DRY NIGHT WITH WEST FLOW ALOFT AND LIMITED LOW/MID LEVEL MOISTURE. FRIDAY...FLOW ALOFT BACKS TO SOUTHWEST IN ADVANCE OF NEXT SHORTWAVE TROUGH. WITH RETURN OF LOW/MID LEVEL THETA-E RIDGE AXES...DIFFERENTIAL HEATING AND TYPICAL AFTERNOON INSTABILITY...ISOLATED TO SCATTERED AFTERNOON THUNDERSTORMS ON TAP. THUNDERSTORM INTENSITY WILL BE MITIGATED AND LIMITED BY LIMITED CAPE. RUBIN .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY. PROGRESSIVE UPPER LEVEL WEATHER PATTERN EXPECTED IN THE MEDIUM RANGE FOR THE WEEKEND AND EARLY NEXT WEEK...WITH A COUPLE OF UPPER LEVEL TROUGH PASSAGES. COLD FRONTS ASSOCIATED WITH THE UPPER LEVEL TROUGHS ARE NOT EXPECTED TO DROP HIGH TEMPERATURES BEYOND THE MID-40S IN MOST AREAS...WITH SATURDAY EXPECTED TO BE THE COOLEST DAY IN THE PERIOD. FRIDAY NIGHT AND SATURDAY WILL ALSO HAVE THE BEST CHANCES FOR PRECIPITATION IN THE PERIOD AS THE COLD FRONT MOVES THROUGH BENEATH THE CYCLONIC CURVED FLOW IN THE UPPER TROUGH. TEMPERATURES ARE EXPECTED TO REBOUND TO NEAR NORMAL VALUES...GENERALLY FROM THE MID-60S TO AROUND 70 DEGREES...ACROSS THE AREA FOR SUNDAY AND MONDAY AS AN UPPER LEVEL RIDGE MOVES OVERHEAD. LATE MONDAY...THE WESTERN PORTION OF THE AREA WILL BEGIN TO SEE INCREASED SHOWER CHANCES WITH SOUTHWEST FLOW ALOFT AHEAD OF THE NEXT UPPER LEVEL TROUGH. THE GFS MODEL IS SLIGHTLY FASTER MOVING THIS NEXT UPPER TROUGH ACROSS THE WYOMING FRONT RANGE COMPARED TO THE SLOWER EUROPEAN MODEL SOLUTION TUESDAY AND INTO WEDNESDAY. AT THIS TIME...WILL HAVE AROUND CLIMATOLOGICAL PRECIPITATION CHANCES IN ACROSS THE AREA WITH TIMING STILL IN QUESTION. && .AVIATION...TONIGHT...SCATTERED THUNDERSTORMS PRODUCING GUSTY WINDS AND LOCALIZED MVFR. LOCALIZED FOG AFTER MIDNIGHT PRODUCING MVFR. THURSDAY...ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WITH VFR. THURSDAY NIGHT...VFR. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM/AVIATION...RUBIN LONG TERM....CARPENTER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 330 PM MDT WED MAY 7 2008 NEZ001>003-019>021-054-055-WYZ059>070-081600- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON- SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 330 PM MDT WED MAY 7 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...MOST NUMEROUS ALONG A LOW LEVEL CONVERGENCE AXIS FROM BAGGS WYOMING TO DOUGLAS WYOMING. THUNDERSTORMS WILL MOVE NORTHEAST AT 20 MPH. SCATTERED THUNDERSTORMS WILL CONTINUE TONIGHT...MOST NUMEROUS NEAR SURFACE LOW PRESSURE ACROSS CONVERSE AND NIOBRARA COUNTIES. ALTHOUGH THE MAJORITY OF THE STRONGEST THUNDERSTORMS WILL PRODUCE SMALL HAIL AND WIND GUSTS TO 50 MPH...A FEW SEVERE THUNDERSTORMS WILL BE POSSIBLE PRODUCING LARGE HAIL AND DAMAGING WINDS. RAINFALL AMOUNTS WILL RANGE FROM ONE QUARTER TO ONE HALF INCH WITH LOCALIZED AMOUNTS OF ONE HALF INCH TO ONE INCH FROM THE STRONGER THUNDERSTORMS. SCATTERED THUNDERSTORMS WILL CONTINUE AFTER MIDNIGHT TONIGHT ACROSS THE WESTERN NEBRASKA PANHANDLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WILL OCCUR ON THURSDAY. WITH SCATTERED LATE DAY THUNDERSTORMS ON FRIDAY. LESS THUNDERSTORM COVERAGE IS EXPECTED DURING THE AFTERNOONS AND EVENINGS ON SATURDAY AND SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. AS ALWAYS... YOUR NATIONAL WEATHER SERVICE APPRECIATES ANY WEATHER REPORTS YOU CAN PROVIDE. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE RUBIN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
348 PM MDT WED MAY 07 2008
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0348 PM HAIL 10 W GLENROCK 42.86N 106.07W
05/07/2008 E0.75 INCH CONVERSE WY LAW ENFORCEMENT
I-25 MM 175
&&The Riverton/Lander radar (KRIW), 198 km away, was scanning. The volume nearest the first event began at 21:47 UTC.
2 hail. Local standard time, as filed.
A severe thunderstorm produced hail from 3/4 to 1 inch in diameter in the vicinity of Glenrock, Wyoming.
A severe thunderstorm produced hail around 1 inch in diameter as it tracked slowly eastward across a portion of Goshen county, Wyoming, with the largest hail reported from Yoder, Wyoming.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2008Every state in 2008This day in weather historyWarnings in Wyoming, May 2008
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 86781, 86782.